EP0686865A1 - Night vision system for motor vehicles - Google Patents

Night vision system for motor vehicles Download PDF

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Publication number
EP0686865A1
EP0686865A1 EP19950201181 EP95201181A EP0686865A1 EP 0686865 A1 EP0686865 A1 EP 0686865A1 EP 19950201181 EP19950201181 EP 19950201181 EP 95201181 A EP95201181 A EP 95201181A EP 0686865 A1 EP0686865 A1 EP 0686865A1
Authority
EP
European Patent Office
Prior art keywords
image
night vision
vision system
system according
driver
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19950201181
Other languages
German (de)
French (fr)
Other versions
EP0686865B1 (en
Inventor
Doyle Joseph Groves
William Garrison Shogren
Joseph Edward Harter, Jr.
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Delco Electronics LLC
Original Assignee
Delco Electronics LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to US257310 priority Critical
Priority to US08/257,310 priority patent/US5414439A/en
Application filed by Delco Electronics LLC filed Critical Delco Electronics LLC
Publication of EP0686865A1 publication Critical patent/EP0686865A1/en
Application granted granted Critical
Publication of EP0686865B1 publication Critical patent/EP0686865B1/en
Anticipated expiration legal-status Critical
Application status is Expired - Lifetime legal-status Critical

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Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B23/00Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/12Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices with means for image conversion or intensification
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R1/00Optical viewing arrangements
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01Head-up displays
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R2300/00Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle
    • B60R2300/10Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the type of camera system used
    • B60R2300/106Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the type of camera system used using night vision cameras
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R2300/00Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle
    • B60R2300/20Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the type of display used
    • B60R2300/205Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the type of display used using a head-up display
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R2300/00Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle
    • B60R2300/30Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the type of image processing
    • B60R2300/307Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the type of image processing virtually distinguishing relevant parts of a scene from the background of the scene
    • B60R2300/308Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the type of image processing virtually distinguishing relevant parts of a scene from the background of the scene by overlaying the real scene, e.g. through a head-up display on the windscreen
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R2300/00Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle
    • B60R2300/80Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the intended use of the viewing arrangement
    • B60R2300/8053Details of viewing arrangements using cameras and displays, specially adapted for use in a vehicle characterised by the intended use of the viewing arrangement for bad weather conditions or night vision
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01Head-up displays
    • G02B27/0101Head-up displays characterised by optical features
    • G02B2027/011Head-up displays characterised by optical features comprising device for correcting geometrical aberrations, distortion
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01Head-up displays
    • G02B27/0101Head-up displays characterised by optical features
    • G02B2027/0138Head-up displays characterised by optical features comprising image capture systems, e.g. camera
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01Head-up displays
    • G02B27/0101Head-up displays characterised by optical features
    • G02B2027/014Head-up displays characterised by optical features comprising information/image processing systems
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B27/00Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01Head-up displays
    • G02B27/0179Display position adjusting means not related to the information to be displayed
    • G02B2027/0187Display position adjusting means not related to the information to be displayed slaved to motion of at least a part of the body of the user, e.g. head, eye
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/08Mirrors
    • G02B5/10Mirrors with curved faces
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/30Transforming light or analogous information into electric information
    • H04N5/33Transforming infra-red radiation

Abstract

A motor vehicle (10) is equipped with an infrared camera (12) for viewing roadway conditions in terms of a thermal image, and outputs a video signal to a head up display (HUD) (18) which projects the camera view to the driver (24) via the windshield (22) or other combiner to display a virtual image (23) in the driver's field of view. The HUD (18) is configured to magnify the image to the same size as the visual or real scene, and compensates for camera (12) and windshield (22) distortion. The virtual image is presented above or below the real scene or may be superimposed on the real scene. A video processor (14) allows selection of only the warmest objects for display.

Description

  • This invention relates to a night vision enhancement system for motor vehicles and particularly to such a system incorporating head up display technology.
  • It has often been proposed to use infrared cameras to produce images of a roadway revealing warm objects such as humans, animals or other sources of infrared radiation. This has the advantage of detecting such objects at night particularly if they are beyond the range of vehicle lights. Such systems have typically used a video monitor or the like to display the detected objects. A traditional monitor is bulky and difficult to locate in a convenient place for viewing, and requires the driver to look away from the roadway to observe the infrared image. The image would be quite small relative to the real roadway scene so that there could be some difficulty in accurately judging the distances of the objects being displayed. Thus if an object is not visible in the real scene, it is hard to determine its location.
  • It is also known to employ head up display techniques to project instrument images or vehicle parameter data onto the vehicle windshield or other combiner so that the display is in or immediately adjacent to the driver's line of sight. Such displays have been quite small relative to the roadway scene due to the limited space available for the required image source and projection mirrors.
  • The present invention seeks to provide an improved night vision system.
  • According to an aspect of the present invention, there is provided a night vision system for a motor vehicle as specified in claim 1.
  • The preferred embodiment provides enhanced night vision by infrared imaging in the line of sight of a vehicle driver. Object images may be displayed from an infrared source so as to have a one to one ratio with real objects observed by the driver.
  • The preferred embodiment includes an infrared sensor or camera mounted on a vehicle to view the roadway in front of the vehicle and generate a video signal representing the thermal image of the roadway, a video processor for improving characteristics of the video signal, and a head up display (HUD) having a video display responsive to the video signal, and an aspheric mirror for reflecting the display image onto the vehicle windshield or other combiner so that the vehicle driver can view a virtual image of the display image which appears to be in front of the vehicle. The optical parameters of the camera and of the HUD are preferably chosen to provide a 1:1 ratio of the image and the real scene observed by the driver.
  • By placing the image directly in the driver's field of view the image can be superimposed on the real scene. Then, warm objects in front of the vehicle will be highlighted if they were illuminated by the headlight beam, and they will be displayed in proper relationship to illuminated objects even if they are beyond the range of the lights. Alternatively, the image may be directed a few degrees below the primary field of view so that the infrared image appears just below the real scene. The latter approach is easier since no image registration is necessary as it is for the superimposed images. Still, by virtue of a 1:1 image ratio, the real position of a warm object shown in the HUD display can be readily determined.
  • In the infrared camera, due to the high cost of lenses suitable for infrared, focusing mirrors are used for the camera optics, and these tend to introduce image distortion. In one design, for example, otherwise horizontal lines tend to droop at both ends to produce a "frown effect". The aspheric mirror is designed to correct for that distortion. The aspheric mirror has previously been used to compensate for distortion due to windshield curvature, each style of windshield requiring a custom designed mirror. In this embodiment, the aspheric mirror design takes into account the camera distortion as well as the windshield distortion.
  • The video processor is preferably designed so that it can be set to an "object detect" mode, if desired, to select only the signals from the warmest objects so that those objects will be displayed and other background objects will be suppressed. This will attract the driver's attention to the warmest objects which are generally the most important ones to be made aware of. By driver selection, however, a full contrast mode can be employed to display all the infrared information.
  • An embodiment of the present invention is described below, by way of example only, with reference to the accompanying drawings, in which:
    • Figure 1 is a schematic view of an embodiment of night vision enhancement system mounted in a vehicle;
    • Figure 2 is the display portion of the system of Figure 1;
    • Figure 3 is a top view of a roadway scene showing an infrared camera view of the scene;
    • Figures 4 and 5 are illustrations of driver views of night vision enhancement display for two different display configurations;
    • Figure 6 is a block diagram of a camera and display portion of the system of Figure 1; and
    • Figure 7 is a graph of video signals according to selectable modes of operation.
  • Referring to Figures 1 and 2, a vehicle 10 is equipped with night vision apparatus comprising a front-mounted infrared camera 12 or sensor which has a standard RS-170 video output signal, a video processor 14 connected to the camera 12 output, and a head up display (HUD) system 16 including an image source or display 18 connected to the video processor output, and an aspheric mirror 20 which reflects the display image to the vehicle windshield 22, creating a virtual image 23 for viewing by the vehicle driver 24. The display 18 recreates the image in shades of grey. A separate combiner may be used instead of the windshield. The HUD 16 is installed beneath the vehicle dash 26 which has an upper opening for light passage to the windshield.
  • The infrared camera 12 preferably has a field of view of about 12 degrees or more horizontally and a smaller vertical field in the range of 6 - 9 degrees. While a camera having a wider angle may be used, only the image portion within the prescribed angle should be displayed for optimum effect. The horizontal view of the camera is illustrated in Figure 3 which depicts the vehicle on a two lane roadway. The limit of the headlight range is indicated by the dashed line 28. A first person 30 is shown in the lane of the vehicle within the headlight range and a second person 32 is shown beyond the headlight range.
  • The infrared camera 12 comprises a sensing element operable at room temperature (i.e., cryogenic cooling is not required) and focusing optics which use mirrors instead of lenses. The camera senses the thermal pattern or the image of infrared radiation in its field of view. Preferably the camera should be sensitive to radiation in the mid-infrared range or about 8-12 micrometres. Since hot objects radiate more infrared energy then cool objects, the hot or warm objects will yield stronger signals. Thus animals, including humans, which are warm show up prominently in the image. Other heat emitters such as vehicle lights and exhaust pipes or traffic lights also show up very well. By presenting this information to the vehicle driver, the direct visual image of the roadway and its environs is augmented.
  • A common side effect of camera mirror arrangements is some image distortion, particularly a drooping at each side of the image. The video signal output from the camera to the display transfers that distortion to the display image. To avoid misinterpretation of the display by the driver it is desirable to correct for the distortion. Accordingly, the aspheric mirror 20 is shaped to compensate for that distortion as well as any distortion arising from the windshield curvature.
  • The aspheric mirror 20 is positioned to project the image to the windshield 22 or other combiner where it is reflected to the driver 24 as a virtual image which appears to be just at the front of the vehicle. The size of the image is consistent with the real scene observed by the driver. For example, if an object subtends an angle of one degree in the real image, the virtual image will also subtend an angle of one degree. The location of the image may be low in the windshield, or just above the end of the headlight range in the windshield. It also may be registered with the real image; in that case the image should be projected a large distance in front of the vehicle to reduce parallax arising from the distance between the camera and the driver's eyes. In practice, using a camera having a 12 degree field of view (or using a 12 degree portion of a larger field), and an LCD display 81 mm wide, a 6 x magnification by the aspheric mirror created a virtual image having a 12 degree field of view, thereby affording a 1:1 ratio of the image to the real world scene.
  • Figure 4 represents the real and the display imaged seen by the driver for the Figure 3 condition. The real image 30' of the person 30 illuminated by the vehicle headlights is visible to the driver but the person 32 is invisible. Both figures are detected by the IR camera and displayed as virtual images 30'' and 32'' below the real image 30'. The Image 30'' appears to be the same size as the image 30'. Thus the driver is forewarned of the presence of the second person 32 in the roadway. Figure 5 illustrates the condition where the HUD image is superimposed on the real image thereby correctly placing the HUD image in the roadway. This technique is more difficult to implement due to concerns of parallax caused by the separation of the camera from the driver, and the normal movement of the driver's head. A very satisfactory display location had been found to be at the lower part of the windshield where the central ray of the image is 5 degrees below horizontal.
  • As shown in Figure 6, the video processor 14 couples the video signal from the camera 12 to the LCD display 18, each being subject to controls 38. The controls should be easily accessible to the driver by mounting on the steering wheel or the instrument panel. Voice activation is another potential technique for control operation. The controls may select image polarity at the camera 12 to establish hot objects to be either white or black. The full contrast mode or object detect mode may be selected at the video processor 14. This is accomplished by passing the whole signal range for full contrast or suppressing weak (cool) signals to display only the warmer objects. Figure 7 shows in solid lines that low input video signals are suppressed for the object detect mode, while full contrast is shown in dotted line wherein the whole signal is passed to the display 18. Grey limit adjustment is also made at the processor 14. The display 18 is controlled to adjust brightness, adjust image position, or to turn the image on or off.
  • It will thus be seen that the embodiment of night vision enhancement system described can provide both a very practical implementation as well as a very flexible system in terms of how the infrared image is presented in or adjacent to the driver's line of sight. The 1 x magnification permits an intuitive assessment of the virtual image and the relationship of IR images to the real world scene, thereby providing roadway information which is not normally available and presenting it in its most useful form.
  • The disclosures in United States patent application no. 08/257,310, from which this application claims priority, and in the abstract accompanying this application are incorporated herein by reference.

Claims (10)

  1. A night vision system for a motor vehicle comprising an infrared camera (12) mounted on the vehicle (10) for viewing a roadway scene and operative to produce a video signal representing a thermal pattern of the scene; a head up display (16) comprising a combiner (22) in the field of view of a vehicle driver, a video display (18) for emitting an image, and an aspheric mirror (20) for reflecting the image onto the combiner (22) for viewing by the driver as a virtual image; the video display (18) being responsive to the video signal for displaying the thermal pattern as a visible image; and the video display (18) and aspheric mirror together affording a one-to-one size ratio of the virtual image to the real roadway scene observed by the driver.
  2. A night vision system according to claim 1, wherein the aspheric mirror is operative to correct camera distortion.
  3. A night vision system according to claim 1 or 2, wherein the combiner comprises a vehicle windshield (22), the aspheric mirror being operative to compensate for distortion introduced by the windshield.
  4. A night vision system according to claim 1, 2 or 3, wherein the horizontal field of view of the generated virtual image is of the order of 12 degrees.
  5. A night vision system according to any preceding claim, wherein the video display is operative to display an image having substantially the same field of view as the virtual image.
  6. A night vision system according to any preceding claim, wherein the field of view of the camera is substantially the same as that of the displayed virtual image.
  7. A night vision system according to any preceding claim, wherein the virtual image is positioned below the driver's line of sight to the real roadway scene.
  8. A night vision system according to any one of claims 1 to 6, wherein the virtual image is superimposed on the real roadway scene.
  9. A night vision system according to any preceding claim, wherein the video signal is coupled to the video display (18) by a video processor (14), the video processor (18) including an object detection mode for limiting the signal to the warmest objects in the scene.
  10. A night vision system according to claim 9, wherein the video processor includes a full contrast mode for providing a wide thermal range of object images in the signal; and a driver control for selecting the object detection mode or the full contrast mode.
EP19950201181 1994-06-09 1995-05-08 Night vision system for motor vehicles Expired - Lifetime EP0686865B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US257310 1994-06-09
US08/257,310 US5414439A (en) 1994-06-09 1994-06-09 Head up display with night vision enhancement

Publications (2)

Publication Number Publication Date
EP0686865A1 true EP0686865A1 (en) 1995-12-13
EP0686865B1 EP0686865B1 (en) 1998-11-25

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DE (2) DE69506174D1 (en)

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